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In page Joan of Portugal:

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On 21 May 1455 in Cordoba,[1] she married King Henry IV of Castile, who had his first marriage to Blanche II of Navarre annulled after thirteen years of marriage. It was rumoured that their marriage had never been consummated due to the king's impotence.[citation needed] Henry and Joan shared the same maternal grandparents; Ferdinand I of Aragon and Eleanor of Alburquerque (making them first cousins). They also shared the same paternal great-grandfather; John of Gaunt, 1st Duke of Lancaster (making them second cousins).